Receiving apparatus for high-frequency signaling



Aug. 7, 'i923 f 5. LOEWE RECEIVING APPARATUS FOR HIGH FREQUENCYSIGNALING Filed March 19. 1921 f VMM, W,

STATES 1,464,083 PATE oFrl.

KEGMUND LOEWE, 0F BERLIN, GERRY, ASSIGNOB 'T0 WESTERN IELlidl'ilfmlt()COMPNY, INCORPORATED, @E NEW YBJK, N. Y., A COBPRTKON 0F NEW YORK.

To all whom t may concer/rt: p

Be it known that l, SIEGMUND lbonvvn, a citizen of the German Republic,residing at Berlin, Germany, have invented certain new and usefulimprovements in Receiving Apparatus for High-Frequency Signallng (torwhich l have filed application in Germany, heb. 23, 1920), of w ich thefollowing is a full, clear, concise, and exact description.

The present invention deals with a specially simple and convenientarrangement for producing heterodyne reception in telegraphy with orwithout wires. An advantage of the present method is that a speciallocal generator circuit is avoided and only one operation is needed tochange the tuning and the frequency of the locally produced waves.'llhere are special advantages with reference to the use of energy whichare conveniently odered by the present arrangement. rilhe system is welladapted to those types of receivers employing a local source oiI wavesof a Jfrequency in the neighborhood of the received waves.

Two possible systems employing vention are shown in Figs. 1 and 2.

Fig. l: 1 is a frame or loop antenna with tuning condenser 2. 3 is theanode ot an electron discharge tube T, 4 its grid, 5 the incandescentcathode, 6 the heating battery. r.lhe source of potential tor the tubeis connected between the terminals 7 and 8. By this means locallygenerated waves are applied to the input circuit of the tube 9 the inrthrough the antenna. The terminals oit condenser 2 are connected to thegrid and cathode ot an amplifier tube 9, in whose anode circuit there isa battery and may be a high resistance 10, from which a lead isconnected to the grid of the next ampliiier tube 11. A blockingcondenser and a telephone 12 are connected in the anode circuit ot thistube. rlhe necessary detecting action will take place in the tube 9 orthe tube 11.

A. particular advantage ot this arrangement is that the vaccum tube needonly be connected to a part of coil 1 so that the received energy in theantenna 1 can be conducted to tube 9 with as little loss as possible. lnother words only a portion of the voltage across the antenna whichresults from received waves is impressed upon the device T. Fig. 2 showsanother possible application. A tube 13 having suitable circuits forgen- @rating oscillations is Connected with the ATU@ FR HIGH-FREQUENCYSIGNAIING.

arch 319, 1952i. Serial No. Mld.

frame antenna and has the usual feed back, while the rest of thearrangement is the same as in Fig. 1. 'llhe loop antenna 1 com*- prisesinductance 13 and 14 in series with the variable condenser 2. A coil 15coupled to the c'oil 14 provides a iced-back connection for theoscillation generating tube 13. lf the condenser 2 is varied to changethe circuit to receive another wave length the frequency of the locallygenerated oscillations `is changed approximately the same amount so thebeat or did'erence frequency remains approximately the same.

The novel features believed to be inherent in the invention are deiinedin the appended claims.

What is claimed is:

1. A. receiving system comprising a loop antenna, a receiving electricdischarge tube connected across an element of said antenna, inductancein said antenna, and an electric discharge device tor supplying locallyproduced oscillations to said antenna connected across a portion of saidinductance.

2. A receiving system comprising a loop antenna, a circuit fortranslating received signals connected to said antenna, a device forsupplying locally produced oscillations to said antenna, and meansconnecting said antenna to said device whereby only a portion ot theelectromotive force developed in said antenna is applied to said device.

3. A receiving circuit comprising a space discharge device functioningas an oscillation generator, a loop antenna having an impedance elementconnected across two electrodes ot said device, a feed-back connectionfrom said antenna to said device, and in addition to said deviceJ atranslating circuit for received signals coupled to said antenna.

d. A receiving system comprising a loop antenna,a space discharge devicehaving appropriete circuits connected thereto whereby said devicefunctions as an oscillation generator, said circuits including saidantenna, reactance means in said antenna, a portion only ot saidreactance means being coupled to said device in a manner effective totransfer energy 'from said antenna to said device, and areceptioncircuit coupled to said antenna.

ln witness whereof, ll hereunto subscribe my name this ninth day otFebruary A.

De. SFIEELGMUND LGME.

